Make locale string from locale id

make_locale_id_string.cpp

// https://www.codeproject.com/Articles/9600/Windows-SetThreadLocale-and-CRT-setlocale
// 0x0411 -> "japanese_Japan.932"
// 0x041E -> "Thai_Thailand.874"
// 0x0808 -> "Chinese (Simplified)_China.936"
std::string make_locale_id_string(LCID locale_id)
{
	std::string ret;
	std::array<char, 128> buf;
	buf.fill(0);

	int const buf_writable = buf.size() - 1;

	int result = GetLocaleInfoA(locale_id, LOCALE_SENGLANGUAGE, buf.data(), buf_writable);
	if(result == 0) {
		return ret;
	}

	ret = buf.data();
	buf.fill(0);

	result = GetLocaleInfoA(locale_id, LOCALE_SENGCOUNTRY, buf.data(), buf_writable);
	if(result == 0) {
		return ret;
	}

	if(*buf.data() != NULL) {
		ret += std::string("_") + buf.data();
	}

	result = GetLocaleInfoA(locale_id, LOCALE_IDEFAULTANSICODEPAGE, buf.data(), buf_writable);
	if(result == 0) {
		result = GetLocaleInfoA(locale_id, LOCALE_IDEFAULTCODEPAGE, buf.data(), buf_writable);
		if(result == 0) {
			return ret;
		}
	}

	if(*buf.data() != NULL) {
		ret += std::string(".") + buf.data();
	}

	return ret;
}